WATER POLLUTION SITUATION AND APPLIED WASTEWATER TREATMENT STRATEGIESINBANGLADESH.

Bangladesh, a developing country, located in South Asia along with large population size but with limited land. Due to rapid industrialization and urbanization, scarcity of clean water is rising up day-to-day. Contrary, contamination or pollution of water is still increasing for which many factors are playing roles. The prime source of drinking water in Bangladesh is groundwater and the wide causes for the water pollution is arsenic contamination. Then other major sources of water pollution included industrial wastewater, municipal wastewater, pesticides and chemicals usage in agriculture, road construction, oil spills, salinity intrusion, heavy metals, sedimentation deposit during the flood, and illegal disposal of suspended matters into water bodies. Currently, water pollution is a principal environmental issue in Bangladesh. With-a-view to solving this paramount problem, a lot of water treatment technologies have already been introduced in Bangladesh paradigm – physical, chemical, and biological process (shafi filter, tin kolsi method, oxidation, coagulation, precipitation, adsorption, reverse osmosis, solar desalinization, and new technology for oil removal. But in a case of industrial effluent and municipal wastewater treatment is still limited within primary treatment process. Salinity intrusion is a big problem in the whole southern part of the country but it still unresolved. Further, agricultural pesticide runoff is causing depletion of fishes but there is no step for controlling it. For removing sedimentation deposit in a river, a degrading program has already commenced but not sufficient. But still, there is not found any resource recovery process from wastewater in Bangladesh.